Door-check.



H. G. VOIGHT.

DooR CHECK.

, APPLICATION FILED JAN. 2'8, 1914.

Patented Mar. l?, 1914.

4U 5. @gli/5 7 5 i 5 E vf/a, @ai n 3mm/to@ GH u .Hmmm w.

@NEFF arriba.

noon-CHECK.

Specification of Letters Patent.

Patented Mar. 11? i944.

Application filed January 28, 1914. Serial No. 814,857.

To all whom t may concern Be it known that I, HENRY Voioirr, a citizenof the United States, residing at New Britain, county of Hartford, Stateof Connecticut, have invented certain new and useful Improvements inDoor-Checks, of which the following is a full, clear, and eXactdescription.

My invention relates to improvements in liquid checks, the object beingto improve the check construction and to provide simple and eiectivemeans to prevent leakage.

`In the particular form herein shown, the check is designed to operatein connection with a door controller arm and is combined with a springwhereby the arm will be moved by the spring in a direction to close thedoor, the speed ofthe closing movement being reduced and controlled bythe check.

In the accompanying drawings, Figure l is a side elevation, partly insection, on the line www of Fig. 4. Fig. 2 is a side elevation of thepiston, partly in section. Fig. 3 is a side elevation of part of thepiston. Fig. 4 is a cross section on the plane of the line y-y of Fig.l. Fig'. 5 is a side elevation of the piston head, removed. Fig. 6 is aplan view thereof.

l represents a check cylinder.

2 represents a piston rod. y

3 represents a piston head connected with the piston rod 2 in the mannerhereinafter described.

It will be understood that in operation it is customary to suitablyattach the outer end of the piston rod to one of the complementarymoving parts to be controlled, and it is customary to attach theopposite end of the cylinder to the other complementary part to becontrolled so that as the parts move in one direction, the action of thepiston in the cylinder will be resisted by liquid and the too rapidmovement of the parts checked thereby. The particular method ofconnecting the checking mechanism to the parts to be controlled isimmaterial.

The piston head is mounted upon what I will term a coupling. Thiscoupling includes the sleeve portion 4 which has a central `passagedesigned to receive the end of t-he rod 2, the said rod being secured insaid passage. At the lower end of the sleeve portion are radial arms orflanges 5-5. At the lower end of the coupling and carried at the lowerend of the radial arms 5, is a valve 6. Directly above the valve andspaced apart therefrom is an alined annular baille plate 7, the bore ofthe sleeve 4 eX- tending substantially centrally therethrough. There isa central passage through the valve 6 in which is loosely mounted asecond valve 8 carried by the first valve. This second valve is in theform of a sleeve having a flanged portion arranged to seat around lthepassage when the piston is being moved against the liquid in the lowerend of the cylinder. The sleeve has a limited loose play in the passagein which it stands and the passage through the valve sleeve 8 is in linewith the passage through the sleeve 4 and plate 7. The piston head 3 ismounted by means of pins or screws 9 9, or other suitable connectingdevices, on the lower end of the coupling so as to have a limited amountof loose play. The piston head 3 has a large escape passage therethroughand preferably centrally thereof at the edge of which is formed a seatdesigned to receive the valve 6 of the coupling so as to make asubstantially liquid-tight joint when the piston is moving against theliquid in the lower end of the cylinder; that is to say, moving in thechecking direction. When, however, the piston moves in the oppositedirection, the coupling will move away from the piston head slightly,opening a relatively free passage past the valve 6 to permit the pistonto return freely.

l0 is a tapered valve pin carried by the lower end of the cylinder andprojecting through the valve sleeve 8 and into the bore of the sleeve 4and battle plate 7 (see Fig. l). This pin l0 has a central passage whichhas a lateral vent ll. l2 is an adjusting valve, the outer end of whichis eX- posed for manual operation, the inner end of which is designed toregulate the size of the vent passage ll. fit the opposite end of thecylinder is the usual cover' 14 which may constitute a guide for the rod2 and which may be provided, if desired, with an antifriction packing 15held in place by a suitable gland 16. By loosely mounting the pistonhead 3 upon the coupling by which it is connected to the rod 2, it willbe seen that a two-fold advantage is gained; namely, the piston head isself-centering in the cylinder l, and by having the limited loose play,the said piston head may move away from the valve 6 on the outgoingstroke of the piston to permit the liquid to flow freely into the lowerend of the cylinder past the piston.

lll)

readily through the piston to the checking end of the cylinder. When thedirection of movement of the piston is reversed, the

valves 6 and S, will close, preventing liquid from passing the pistonexcepting through the tubular sleeve S around the tapered pin.Obviously, if the piston rod 2 is moved with force, the liquid flowingthrough this sleeve will be forced therethrough in a rapid stream. Thisstream will encounter the annular baflie 7 and will be thereby directedlaterally against the side walls of the cylinder l. On the checkingstroke a part of the liquid will, of course, run through the ventpassage l1 and through pin 10. The vent may be regulated by the valve1Q. to vary the freedom of How, and to a corresponding eX- tent, varythe speed of movement of the pist0n on the checking stroke. Heretofore Ihave found that in the absence o/f the baffle device 7 the powerfulstream of liquid forced through the space between the pin andsurrounding sleeve 8 has been so great as to cause very objectionableleakage at the upper end of the cylinder around the rod 2, requiringthat the cylinder be frequently refilled. This is most objectionablebecause such devices are frequently placed in very inaccessible places,thereby causing great annoyance and unnecessary labor. By myimpro-vement. herein disclosed, I have overcome this defect. In fact, ithas been overcome to such an extent that in some instances the upper endof the cylinder may actually have a free opening therein without dangerof leakage.

In the particular form of improvement I have shown, I have provided incombination with the checking means a spring closer which includes, inthe speciiic form shown, a coil spring 1.7 arranged within the cylinderl and bearing at one end against the cap 11i and at the other endagainst the piston coupling. I have also provided a short auX- iliarychecking spring 1S around the rod 2. By these additions the devicebecomes a selfcontained closer and check.

It will be understood that in the preferred form of my invention thepiston head has a limited longitudinal movement indepeiidently of thepiston rod for the purposes described, but from a broad standpoint, andso far as concerns the means for preventing leakage it is non-essentialthat the piston head be carried by the piston rod in such a manner as toafford limited independent movement.

Ihat claim is:

l. In a check, a cylinder, a checking means comprising a piston rod, acoupling carried thereby, a piston head carried by said coupling andhaving limited longitudinal movement relatively thereto, an escapepassage through said piston head, a valve carried by said couplingarranged to close said passage on the checkingstroke, a

passage through said valve and a baiiie plateV carried by said couplingabove said passage to divert a stream of liquid Vflowing throughV saidpassage when the piston is being moved in the checking direction.

2. In a check, a cylinder, a checking piston, a checking meanscomprising a piston rod, a coupling carried thereby7 a piston headcarried by said coupling and having limited longitudinal movementrelatively thereto, an escape passage through said piston head, a valvecarried by said coupling arranged to close said passage on the checkingstroke, a passage through said valve, a

valve pin carried by the `cylinder and eX- tending into the lastmentioned passage to restrict the area of the same, a bafiie platecarried by the coupling above saidv passage and having a pinclearancepassage, said bathe-plate being arranged to divert a stream ofliquid flowing through lsaid passage and around said pin when the pistonis being moved in the checking direction.

3. In a check, a cylinder, a checking piston, a checking meanscomprising a piston rod, a coupling carried thereby, a piston headcarried by said coupling and having limited longitudinal movementrelatively thereto, an escape passage through said piston head, a valvecarried by saidrcoupling arranged to close said passage on the checkingstroke, a passage through said valve, a valve pin carried by thecylinder'and eX- tending into the last mentioned passage to restrict thearea of the same, a bafiie plate carried by the coupling above saidpassage and arranged to divert a stream of liquid flowing through saidpassage and around said pin when the piston is being moved in thechecking direction, said baille plate having a passage in line with saidvalve pin to permit the latter to pass therethrough as the piston isbeing moved to and fro, a passage through said valve pinhaving a lateralvent and manually operable valve for controlling the operative size ofsaid vent in said pin. c

4. In a liquid check, a cylinder, a checking means comprising a pistonhead, arranged within the cylinder and apiston rod operatively connectedwith said headland leading externally of said cylinder, means` which theliquid is forced in a stream When the piston moves in the oppositedirection, With a baille means arranged close to said passage andmovable With said moving parts and arranged in the path of said streamof liquid to check the force thereof and deflect said stream laterallytoward the side Walls of said cylinder.

5. In a liquid check7 a cylinder, a checking means comprising a pistonhead arranged Within the cylinder and a piston rod operatively connectedwith said head and leading externally of said cylinder, means to permitthe fluid to flow freely from one side of the piston to the other sideWhen the piston moves in one direction, said piston HENRY Gr. VOIGHT.

litnesses:

GWENDOLINE A. JACKSON, CHAS. E. RUSSELL.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patent, Washington, D. C.

